Electrical problem
2005 Chevy Tahoe V8 Two Wheel Drive Automatic 63,000 miles
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I was responding to another person that was having the speedometer not reading correctly. Never had the electrical smell though.
I have the exact same issue. Worked fine until 60,000. Started reading 40-60 mph off then would peg at 120. Waiting to get it into be looked at and started working fine.
Happened again and took it to the shop and they ran a diagnostic and said it checked out fine.
It started doing it again today